Segment And Geographic Information (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2016		Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2015		Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014	[2],[3]
Property, Plant and Equipment [Line Items]
Revenues	$ 77,274	[1]	$ 78,472		$ 71,642		$ 66,966		$ 65,692	[1]	$ 66,117		$ 59,366		$ 58,492		$ 294,354	[2]	$ 249,667	[2]	$ 227,589
Net book value	1,807,010								$ 1,748,211	[4]							1,807,010		$ 1,748,211	[4]
Railcars [Member]
Property, Plant and Equipment [Line Items]
Net book value	$ 370,100																$ 370,100

[1] Amounts for the quarters ended March 31, 2016 and 2015, June 30, 2016 and 2015, September 30, 2016 and 2015, and December 31, 2015 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors")

[2] Amounts for the years ended December 31, 2015 and 2014 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors").

[3] At the inception of the lease, the Company records the total minimum lease payments, executory costs, if any, and unguaranteed residual value as gross finance lease receivables. The gross finance lease receivables are reduced as customer payments are received. There was $2.1 million and no unguaranteed residual value, respectively, at December 31, 2016 and 2015, included in gross finance lease receivables. There were no executory costs included in gross finance lease receivables as of December 31, 2016 and 2015.

[4] Amounts for the year ended December 31, 2015 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors").